Fix embed mode: make .content background transparent

Author: elimelt

scripts/template/styles.css

@@ -872,6 +872,10 @@ html.embed-mode main {
   padding: 1rem;
 }
 
+html.embed-mode .content {
+  background-color: transparent !important;
+}
+
 /* Dark theme override for embeds */
 html.theme-dark {
   --text-color: #f3f4f6;